package com.tsd.core.utils;

import java.io.*;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.*;

/**
 * java.util.zip压缩/解压文件
 *
 * @author Hillpool
 */
public class ZipUtil {

    /**
     * 缓冲器大小
     */
    private static final int BUFFER = 512;

    /**
     * 压缩得到的文件的后缀名
     */
    private static final String SUFFIX = ".zip";

    /**
     * 得到源文件路径的所有文件
     *
     * @param dirFile 压缩源文件路径
     */
    public static List<File> getAllFile(File dirFile) {

        List<File> fileList = new ArrayList<>();

        File[] files = dirFile.listFiles();
        for (File file : files) {//文件
            if (file.isFile()) {
                fileList.add(file);
                System.out.println("add file:" + file.getName());
            } else {//目录
                if (file.listFiles().length != 0) {//非空目录
                    fileList.addAll(getAllFile(file));//把递归文件加到fileList中
                } else {//空目录
                    fileList.add(file);
                    System.out.println("add empty dir:" + file.getName());
                }
            }
        }
        return fileList;
    }

    /**
     * 获取相对路径
     *
     * @param dirPath 源文件路径
     * @param file    准备压缩的单个文件
     */
    public static String getRelativePath(String dirPath, File file) {
        File dirFile = new File(dirPath);
        String relativePath = file.getName();

        while (true) {
            file = file.getParentFile();
            if (file == null) break;
            if (file.equals(dirFile)) {
                break;
            } else {
                relativePath = file.getName() + "/" + relativePath;
            }
        }
        return relativePath;
    }


    /**
     * @param destPath 解压目标路径
     * @param fileName 解压文件的相对路径
     */
    public static File createFile(String destPath, String fileName) {

        String[] dirs = fileName.split("/");//将文件名的各级目录分解
        File file = new File(destPath);

        if (dirs.length > 1) {//文件有上级目录
            for (int i = 0; i < dirs.length - 1; i++) {
                file = new File(file, dirs[i]);//依次创建文件对象知道文件的上一级目录
            }

            if (!file.exists()) {
                file.mkdirs();//文件对应目录若不存在，则创建
                try {
                    System.out.println("mkdirs: " + file.getCanonicalPath());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            file = new File(file, dirs[dirs.length - 1]);//创建文件

            return file;
        } else {
            if (!file.exists()) {//若目标路径的目录不存在，则创建
                file.mkdirs();
                try {
                    System.out.println("mkdirs: " + file.getCanonicalPath());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            file = new File(file, dirs[0]);//创建文件

            return file;
        }

    }

    /**
     * 没有指定压缩目标路径进行压缩,用默认的路径进行压缩
     *
     * @param dirPath 压缩源文件路径
     */
    public static void compress(String dirPath) {

        int firstIndex = dirPath.indexOf("/");
        int lastIndex = dirPath.lastIndexOf("/");
        String zipFileName = dirPath.substring(0, firstIndex + 1) + dirPath.substring(lastIndex + 1);
        compress(dirPath, zipFileName);
    }

    /**
     * 压缩文件
     *
     * @param dirPath     压缩源文件路径
     * @param zipFileName 压缩目标文件路径
     */
    public static void compress(String dirPath, String zipFileName) {


//        zipFileName=zipFileName+SUFFIX;//添加文件的后缀名

        File dirFile = new File(dirPath);
        if (dirFile.exists()) {
            List<File> fileList = getAllFile(dirFile);

            byte[] buffer = new byte[BUFFER];
            ZipEntry zipEntry = null;
            int readLength = 0;     //每次读取出来的长度

            try {
                // 对输出文件做CRC32校验
                CheckedOutputStream cos = new CheckedOutputStream(new FileOutputStream(
                        zipFileName), new CRC32());
                ZipOutputStream zos = new ZipOutputStream(cos);

                for (File file : fileList) {

                    if (file.isFile()) {   //若是文件，则压缩文件

                        zipEntry = new ZipEntry(getRelativePath(dirPath, file));  //
                        zipEntry.setSize(file.length());
                        zipEntry.setTime(file.lastModified());
                        zos.putNextEntry(zipEntry);

                        InputStream is = new BufferedInputStream(new FileInputStream(file));

                        while ((readLength = is.read(buffer, 0, BUFFER)) != -1) {
                            zos.write(buffer, 0, readLength);
                        }
                        is.close();
                        zos.closeEntry();
                        System.out.println("file compress:" + file.getCanonicalPath());
                    } else {     //若是空目录，则写入zip条目中
                        zipEntry = new ZipEntry(getRelativePath(dirPath, file) + "/");
                        zos.putNextEntry(zipEntry);
                        zos.closeEntry();
                        System.out.println("dir compress: " + file.getCanonicalPath() + "/");
                    }
                }
                zos.close();  //最后得关闭流，不然压缩最后一个文件会出错
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 解压
     */
    public static void decompress(String zipFileName, String destPath) throws IOException {
        FileInputStream fileInputStream = null;
        ZipInputStream zis = null;
        ZipEntry zipEntry;
        int readLength = 0;
        try {
            fileInputStream = new FileInputStream(zipFileName);
            zis = new ZipInputStream(fileInputStream);
            byte[] buffer = new byte[BUFFER];
            while ((zipEntry = zis.getNextEntry()) != null) {
                if (zipEntry.isDirectory()) {
                    File file = new File(destPath + "/" + zipEntry.getName());
                    if (!file.exists()) {
                        file.mkdirs();
                    }
                    continue;
                }
                File file = createFile(destPath, zipEntry.getName());
                OutputStream os = null;
                try {
                    os = new FileOutputStream(file);
                    while ((readLength = zis.read(buffer, 0, BUFFER)) != -1) {
                        os.write(buffer, 0, readLength);
                    }
                } finally {
                    FileUtil.safeCloseOutputStrem(os);
                }
            }
        } finally {
            if (zis != null) {
                try {
                    zis.closeEntry();
                    zis.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            FileUtil.safeCloseInputStrem(fileInputStream);
        }
    }

    /*
     * Recursive the specify file also contains the folder which may don't include any file.
     * @param filePath: compress file
     * @param ZipOutputStream: the zipfile's outputStream.
     * @param prefix: the prefix indicates the parent folder name of the file that makes the tier relation.
     */
    public static void zipFiles(String filePath, ZipOutputStream out, String prefix)
            throws IOException {
        File file = new File(filePath);
        if (file.isDirectory()) {
            if (file.listFiles().length == 0) {
                ZipEntry zipEntry = new ZipEntry(prefix + file.getName() + "\\");
                out.putNextEntry(zipEntry);
                out.closeEntry();
            } else {
                prefix += file.getName() + File.separator;
                for (File f : file.listFiles())
                    zipFiles(f.getAbsolutePath(), out, prefix);
            }
        } else {
            FileInputStream in = new FileInputStream(file);
            ZipEntry zipEntry = new ZipEntry(prefix + file.getName());
            out.putNextEntry(zipEntry);
            byte[] buf = new byte[1024];
            int len;
            while ((len = in.read(buf)) > 0) {
                out.write(buf, 0, len);
            }
            out.closeEntry();
            in.close();
        }
    }

    public static void main(String[] args) {
        try {
//            ZipOutputStream outputStream = new ZipOutputStream(new FileOutputStream("D:\\temp\\123.zip"));
//            zipFiles("D:\\temp\\123", outputStream, "");
//            outputStream.close();
            compress("D:\\temp\\123", "D:\\temp\\123.zip");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
